Traditionally, the earliest Christian sanctuary in Britain. Glastonbury Abbey was a rich and powerful monastery in Glastonbury, Somerset, England. Since at least the 12th century the Glastonbury area was frequently associated with the legend of King Arthur, a connection promoted by medieval monks who asserted that Glastonbury was Avalon. History records it as standing in 600. Really mythical, powerful feel to this whole area. Not to be missed.